They were the most radical group and opposed the Girondists. The term, which was first used during a session of the Legislative Assembly, came into general use in 1793. Led by Maximilien Robespierre, the Montagnards unleashed the Reign of Terror in 1793. By the summer of 1793, two minority groups who were referred to as the Mountain and the Girondin, divided the National Convention. The Mountain was composed mainly of members of the middle class, but represented the constituencies of Paris. As such, the Mountain was sensitive to the motivations of the city and responded strongly to demands from the working class sans-culottes.